How to Clean Mold Off Wood: Furniture, Decks and Framing

How to clean mold off wood: put on gloves, goggles and a respirator, vacuum loose spores with a HEPA vacuum, scrub with detergent and water, wipe with white vinegar or 3 percent peroxide, dry quickly with fans, and lightly sand unfinished wood if stains remain. If the wood is soft, crumbling or rotten, replace it instead of cleaning.

How to clean mold off wood: why it is tricky

Wood is porous, so mold can grow into it as well as on it. Finished or sealed wood, like a varnished table, lets you wipe mold off the surface. Raw wood and old framing hold moisture, so surface cleaning may not reach everything. The goal is to remove growth, dry the wood and fix the damp.

Quick facts: how to clean mold off wood
Protection	Gloves, goggles and an N95 or better respirator
Cleaner	Detergent and water, then vinegar or 3 percent peroxide
Drying	Fans and a dehumidifier; wood must dry fully
Replace if	Soft, crumbling, rotten or structurally weak

Step by step

1. Protect yourself and the room. Wear a respirator, goggles and gloves. Open windows and keep family and pets away.
2. Vacuum loose mold with a vacuum that has a HEPA filter. Do not use a regular vacuum or a dry brush, which spreads spores.
3. Scrub with a stiff brush and a mix of dish soap and water, working with the grain. Do not soak the wood.
4. Wipe with a cloth dampened with white vinegar or 3 percent hydrogen peroxide. Wait ten to fifteen minutes.
5. Rinse lightly with a damp cloth and dry immediately with towels.
6. Dry fully with fans and a dehumidifier for at least a day or two.
7. Sand lightly if stains remain on unfinished wood, wearing a respirator, then vacuum the dust with HEPA.
8. Seal or finish the wood once it is dry, to slow future growth.

Which approach for which wood

Wood	Approach
Sealed furniture	Wipe with soap and water, then vinegar; dry
Raw or unfinished furniture	Scrub, dry well, sand lightly, then finish
Deck boards	Scrub with a deck cleaner; rinse; dry in sun
Framing and joists	Clean surface mold, dry, treat; call a pro if widespread
Hardwood floors	Wipe lightly; avoid soaking; call a pro if boards cup
Soft or rotten wood	Replace

Testing for rot

Press a screwdriver into the wood. If it sinks in easily or pieces crumble, the wood is rotten and weak. Replace it. Structural framing that is affected should be checked by a professional before you clean or cover it.

What not to do

Do not pressure wash indoors or on framing, which drives water deep into the wood. Do not paint over mold, which hides it and traps moisture. Do not use chlorine bleach on wood, because it does not soak in and can weaken the fibers and fuel regrowth. Avoid soaking, which feeds the mold.

Prevent it from returning

Control humidity between about 30 and 50 percent, fix leaks, add airflow and keep wood off damp ground and concrete. For decks, allow gaps for drainage and clean leaves and debris off boards. On framing, a borate treatment can help protect dry wood, as a professional advises.

Valuable wood, antiques and instruments

Valuable wood items need gentle care. Wipe with a barely damp cloth, avoid soaking and test a hidden spot first. For antiques, musical instruments and finished furniture of value, a conservator or specialist restorer can treat mold without damaging the finish. Move the item to a dry, ventilated room afterward and keep it away from damp walls.

When to call a professional

If mold is on framing, subfloor or joists, covers more than about 10 square feet, follows flooding, or the wood is soft, call a mold or water damage specialist. Knowing how to clean mold off wood handles furniture and small patches, while structural problems need an expert.

How to clean mold off wood: surface first

Surface mold on sealed or finished wood can often be cleaned with a soft brush, a damp cloth and a mild detergent. Learning how to clean mold off wood starts with testing the surface in an inconspicuous spot, since some finishes react to water and cleaners. Dry the wood fully and keep the air moving. Mold that has soaked into unfinished wood, or that has caused soft spots, needs more than cleaning, because the wood may have started to rot. Fix the moisture source first, or the growth will come back.

If you are unsure how to clean mold off wood antiques or instruments, ask a conservator before you start. A simple test tells you when how to clean mold off wood by surface cleaning is enough and when the piece must be replaced.

Related reading

• Mold After Water Damage: How Fast It Grows and What to Do
• Does Vinegar Kill Mold? What It Can and Cannot Do
• Water Damaged Drywall: Save It, Dry It or Cut It Out?
• Hardwood Floor Water Damage: Cupping, Buckling and Recovery

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